| Variables | B | S.E. | Wald | df | Sig. (p) | Odds ratio |
| Water condition | 0.306 | 1.672 | 0.034 | 1 | 0.855 | 1.358 |
| Cleaning | 3.959 | 1.535 | 6.653 | 1 | 0.010 | 52.428 |
| Food | 1.294 | 1.537 | 0.708 | 1 | 0.400 | 3.646 |
| Constant | −2.496 | 1.794 | 1.936 | 1 | 0.164 | 0.082 |